Supplemental Guarantor Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net cash used in operating activities	$ (7.5)	$ (656.5)
INVESTING ACTIVITIES
Purchases of property and equipment	(18.3)	(14.0)
Purchases of marketable securities	0	(26.8)
Proceeds from the sale or maturity of marketable securities	0	226.7
Decrease (increase) in restricted cash	(3.3)	(5.5)
Net principal increase of mortgage loans held in portfolio and real estate owned	(1.2)	(0.2)
Payments to Acquire Other Investments	0	18.6
Payment related to acquisition of a business	(34.5)	(9.4)
Net cash (used in) provided by investing activities	(57.3)	152.2
FINANCING ACTIVITIES
Net change in notes payable	(55.8)	81.6
Proceeds from stock associated with certain employee benefit plans	3.3	2.1
Income tax benefit from employee stock awards	0.9	0
Cash dividends paid	0	(60.2)
Net cash provided by (used in) financing activities	(51.6)	23.5
(Decrease) increase in cash and cash equivalents	(116.4)	(480.8)
Cash and cash equivalents at beginning of period	936.5	1,047.7
Cash and cash equivalents at end of period	820.1	566.9
D.R. Horton, Inc. [Member]
OPERATING ACTIVITIES
Net cash used in operating activities	(23.5)	(186.2)
INVESTING ACTIVITIES
Purchases of property and equipment	(6.4)	(6.5)
Purchases of marketable securities		(26.8)
Proceeds from the sale or maturity of marketable securities		226.7
Decrease (increase) in restricted cash	(3.7)	(5.3)
Payments to Acquire Other Investments		18.6
Payments for (Proceeds from) Other Investing Activities	(27.4)	(458.1)
Payment related to acquisition of a business	(34.5)	(9.4)
Net cash (used in) provided by investing activities	(72.0)	(298.0)
FINANCING ACTIVITIES
Net change in notes payable	(3.0)	100.0
Proceeds from (Payments for) Other Financing Activities	0	0
Proceeds from stock associated with certain employee benefit plans	3.3	2.1
Income tax benefit from employee stock awards	0.9
Cash dividends paid	0	(60.2)
Net cash provided by (used in) financing activities	1.2	41.9
(Decrease) increase in cash and cash equivalents	(94.3)	(442.3)
Cash and cash equivalents at beginning of period	871.4	968.9
Cash and cash equivalents at end of period	777.1	526.6
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash used in operating activities	(40.3)	(491.3)
INVESTING ACTIVITIES
Purchases of property and equipment	(8.6)	(3.7)
Decrease (increase) in restricted cash	0.3	(0.2)
Payment related to acquisition of a business	0
Net cash (used in) provided by investing activities	(8.3)	(3.9)
FINANCING ACTIVITIES
Net change in notes payable	0	0
Proceeds from (Payments for) Other Financing Activities	30.0	457.8
Net cash provided by (used in) financing activities	30.0	457.8
(Decrease) increase in cash and cash equivalents	(18.6)	(37.4)
Cash and cash equivalents at beginning of period	38.4	56.3
Cash and cash equivalents at end of period	19.8	18.9
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash used in operating activities	96.3	51.0
INVESTING ACTIVITIES
Purchases of property and equipment	(3.3)	(3.8)
Decrease (increase) in restricted cash	0.1	0
Net principal increase of mortgage loans held in portfolio and real estate owned	(1.2)	(0.2)
Net cash (used in) provided by investing activities	(4.4)	(4.0)
FINANCING ACTIVITIES
Net change in notes payable	(52.8)	(18.4)
Proceeds from (Payments for) Other Financing Activities	(2.6)	0.3
Cash dividends paid	(40.0)	(30.0)
Net cash provided by (used in) financing activities	(95.4)	(48.1)
(Decrease) increase in cash and cash equivalents	(3.5)	(1.1)
Cash and cash equivalents at beginning of period	26.7	22.5
Cash and cash equivalents at end of period	23.2	21.4
Eliminations [Member]
OPERATING ACTIVITIES
Net cash used in operating activities	(40.0)	(30.0)
INVESTING ACTIVITIES
Payments for (Proceeds from) Other Investing Activities	27.4	458.1
Net cash (used in) provided by investing activities	27.4	458.1
FINANCING ACTIVITIES
Proceeds from (Payments for) Other Financing Activities	(27.4)	(458.1)
Cash dividends paid	40.0	30.0
Net cash provided by (used in) financing activities	$ 12.6	$ (428.1)